use cmake openCV module

cmake/FindOpenCV.cmake

-
-if(LINUX OR ANDROID)
-  if(LINUX)
-    find_library(OpenCV_CORE_LIBS NAMES "opencv_core")
-    find_library(OpenCV_CALIB_LIBS NAMES "opencv_calib3d")
-    find_library(OpenCV_FEATURES_LIBS NAMES "opencv_features2d")
-    find_library(OpenCV_IMGPROC_LIBS NAMES "opencv_imgproc")
-    find_library(OpenCV_FLANN_LIBS NAMES "opencv_flann")
-    find_library(OpenCV_VIDEO_LIBS NAMES "opencv_video")
-  else()
-    find_library(OpenCV_CORE_LIBS NAMES "opencv_core" PATHS ${CMAKE_EXTERNAL_DEPS}/lib  NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH)
-    find_library(OpenCV_CALIB_LIBS NAMES "opencv_calib3d" PATHS ${CMAKE_EXTERNAL_DEPS}/lib  NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH)
-    find_library(OpenCV_FEATURES_LIBS NAMES "opencv_features2d" PATHS ${CMAKE_EXTERNAL_DEPS}/lib  NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH)
-    find_library(OpenCV_IMGPROC_LIBS NAMES "opencv_imgproc" PATHS ${CMAKE_EXTERNAL_DEPS}/lib  NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH)
-    find_library(OpenCV_FLANN_LIBS NAMES "opencv_flann" PATHS ${CMAKE_EXTERNAL_DEPS}/lib  NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH)
-    find_library(OpenCV_VIDEO_LIBS NAMES "opencv_video" PATHS ${CMAKE_EXTERNAL_DEPS}/lib  NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH)
-    set(OpenCV_INCLUDE_DIRS ${CMAKE_EXTERNAL_DEPS}/include/opencv2)
-  endif()
-
-  set(OpenCV_LIBRARIES
-      ${OpenCV_CALIB_LIBS}
-      ${OpenCV_FEATURES_LIBS}
-      ${OpenCV_FLANN_LIBS}
-      ${OpenCV_VIDEO_LIBS}
-      ${OpenCV_IMGPROC_LIBS}
-      ${OpenCV_CORE_LIBS})
-endif()
-
-if(ANDROID)
-  find_library(OpenCV_HAL_LIBS NAMES "opencv_hal" PATHS ${CMAKE_EXTERNAL_DEPS}/lib  NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH)
-  set(OpenCV_LIBRARIES
-      ${OpenCV_LIBRARIES}
-      ${OpenCV_HAL_LIBS})
-endif()
-
-if(APPLE)
-  if(MACPORTS)
-    find_package(OpenCV REQUIRED core calib3d features2d imgproc flann video PATHS /opt/local NO_DEFAULT_PATH)
-  else()
-    find_package(OpenCV REQUIRED core calib3d features2d imgproc flann video PATHS "/usr/local/opt/opencv@3" "/usr/local" NO_DEFAULT_PATH)
-  endif()
-endif()

lib/CMakeLists.txt

@@ -691,7 +691,7 @@ endif()
 # ----------------------------------------------------------------------------
 # Calibration && AutoCrop && CameraAmbisonics
 # ----------------------------------------------------------------------------
-find_package(OpenCV)
+find_package(OpenCV REQUIRED)
 
 add_subdirectory(src/calibration)
 add_subdirectory(src/autocrop)